1 Department of Neurology, Ajou University School of Medicine, 5 San, Woncheon-dong, Yongtong-gu, Suwon-si, Kyunggi-do, 442-749, South Korea.
2 Department of Neurology, Ajou University School of Medicine, 5 San, Woncheon-dong, Yongtong-gu, Suwon-si, Kyunggi-do, 442-749, South Korea. jhyoon@gmail.com.